Blow-off valve



No. 6l7,l50. Patented 1an. 3, |899.

T. M. EYNUN'.

BLOW-OFF VALVE.

(Application mea Jan. 4, 1898.5 (N o M n d e l Nirn Prion.

BLOW-OFF VALVE.

SPECIFICATION forming part of Letters Patent No. 617,150, dated January3, 1899.

Application led January 4, 1898. Serial No. 665,534. (No model.)

To all whom it may concern:

Be it known that I, THOMAS M. EvNoN, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented a new and useful Improvement in Blow-Off Valves, whichimprovement is fully set forth in the following specification andaccompanying drawings.

It is a well-known fact that it is an eX- tremely diflicult matter tokeep a blow-off valve or cock tight underV the severe conditions towhich they are subjected, since the dirt, sediment, &c., which areprecipitated from the water contained in the boiler and, during theaction thereof, are blown out at a high velocity and the grit and otheringredients cut and score all surfaces with which they come in contact.

Various forms of blow-off valves have been heretofore devised which havefailed to fulfil the requirements; but I have found that by employingcups of suitable material in conjunction with a distance-piece and otheradj uncts, thereby producing a cup-fitted or auxiliary piston, I amenabled to construct a valve which is cheaply manufactured and veryeffective in its operation; and to this end my invention consists of animproved construction of blow-off valve the novel features of which willbe hereinafter fully set forth, and particularly pointed out in theclaims.

Figure l representsa longitudinal sectional view of a blow-od valveembodying my invention. Fig. 2 represents a longitudinal sectional viewof another embodiment of the principle of my invention, showing acuptted piston in combination with a plug or cock.

Similar letters of reference indicate corresponding parts in thefigures.

Referring to the drawings, A designates a valve body creasing, the samebeing provided with a main valve or piston B, which has seated in itslower portion a ring C, of com'- position or other suitable material,said ring being adapted to contact with the valve-seat D, therebyclosing the opening E. 4

F' designates an openin g which may be concentric with the piston B andof substantially the same diameter as the opening E.

Gr designates a main spindle which is provided with the opening H,whereby a 4practically continuous bore is attained throughout the lengthof said main spindle andthro'ugh which the auxiliary or cup-fittedpiston J, whose construction will be hereinafter described, and theconnecting-spindle K may be withdrawn or replaced for the purposes ofinspection. or repairs. The main spindle G is connected withthe piston Bby means of the keeper L in such a manner that said main spindle iscapable of rotation without rotating the piston B, whereby the ring C isenabled to seat or unseat vertically without any grinding motion.

M designates a yoke suitably supported upon the valve body or casing Aandthreaded at its upper portion N to receive the main spindle G, saidyoke being preferably rigidly secured to said valve-body by any suitablemeans, thereby forming the joint P, as is evident, a portion of saidbody having a male counterbore Q, so as to fit the bore of the lowerportion S of the yoke M, whereby the latter is accurately retained inposition under all conditions.

R designates a gland which is adapted to be inserted between the pistonB and the lower portion S of the yoke M, said gland fitting snuglytherein and being provided with any suitable means for retainingitinposition.

The main spindle G is internally threaded at its upper portion T andfitted with a capnut or plug U, which is interiorly threaded to receivethe threaded portion W of the spindle K, which latter is provided at itsupper portion with the hand-wheel X, while the main spindle G isprovided with a hand-wheel Y. The lower end of the spindle K has aflange or shoulder Z thereon, against which is held thelaterally-extending portion A of the angularly-shaped cup B', which iscomposed of any suitable material, the depending portion C of the latterbeing adapted to contact with the walls of the bore F of the piston B,said cup B' beingheldin juxtaposition with the shoulder Z by means ofthe distance-piece D', whose lower portion serves to retain in posi tionthe angularly-shaped cup E,which is clomposed of any suitable material,the laterallyextending flange F of said cup being held between the lowerportion of said distance-piece IOO and the collar-nut G', which latteris held in position by means of the jam-nut H and a split pin or otherdevice.

J' designates the inlet of the valve, and K' the outlet thereof.

The operation is as follows: The valve seen in Fig. l is in closedposition, and it will be evident that upon the rotation of thehandwheelY in the properdirection the main spindle G will be raised,thus unseating the ring C, while the auxiliary piston J, composed of thecups B' E', assembled in the manner described, can also be raised andlowered by the proper rotation of the hand-wheel X at the proper period.

The lower cup E' is adapted to prevent any downward leakage through theoutlet K', while the upper cup B' is adapted to prevent any upwardleakage from the causes hereinabove referred to, it being apparent thatthe cup-fitted piston J by reason of its novel construction willintercept said leakage and prevent any improper escape of the fluidunder all conditions.

It will of course be understood thatin opening the blow-off valve whenthe parts are in the position seen in Fig. l the cup-fitted piston Jshould be raised before the main valve or piston B, and in closing saidmain valve should be closed before the cup-fitted piston is lowered.

It will be apparent that if at any time the cups become defectivethrough use or for any other reason by unscrewing the cap-nut U they maybe removed and new cups placed upon the spindle K, after which the partscan be again assembled, in the manner seen in Fig. l, while the pressureis on the boiler.

In the construction seen in Fig. 2 I show another embodiment of theprinciple of my invention, M designating the valve-casing, which isprovided with the inlet N' and the discharge P'. The inner portion ofthe valve body or casing is provided with a tapered or similar-shapedportion Q', in which is located the plug or piston vR', the latterhaving the opening S therethrough, terminating in the main spindle T',which carries a hand-wheel and cap-nut similar to the one alreadydescribed, said cap-nnt having a threaded opening therethrough, in whichis located a spindle U', which has a flange or shoulder V', againstwhich is held the cup W', similar to the cup already described, by meansof the distance-piece X', said cup moving in the bore Y'. Thedistance-piece X' is counterbored to receive the end Z' of a seconddistance-piece A2, the extremity of which latter engages the cup B2, thelatter having the laterally-extending iiange E2, held between theadjacent portion of said distance-piece A2 and the collar-nut C2, whichlatter is locked by means of the jam-nut D2, 85e., in the-usual manner.E3 designates a ring seated in the lbody or casing M', against which theupwardly-extending portion of the cup B2 is adapted to contact. F2designates an angular shaped ring, a portion G2 of which is adapted tocontact with the adjacent projecting edge of the distance-piece X',while the depending portion H2 of said ring is adapted to seat upon thering or bushing E2, it being of course evident that when the auxiliarypiston J2, formed by the distance-pieces and cups X' and A2, is movedthe upwardly-extending member of the cup B2 moves intotlie space K2within the member H2 of the ring F2. The operation is substantially thesame as has already been described, the cup-fitted or auxiliary pistonJ2 being raised before the main valve R' is actuated, while in closingsaid main valve should be closed before said piston J 2 is lowered, aswill be evident.

Having thus described ny invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In a blow-off valve, the combination of a main valve having aninternal bore, a cupfitted piston formed separate from its spindle andadapted to work i-n said bore, and means for enabling said piston tointercept any leakage from said main valve.

2. In astop-cock or blow-off valve, the combination of a plug or pistonhaving an internal bore, a cup-fitted piston adapted to work therein, aspindle upon which said cup-fitted piston is mounted,means for enablingthe cupiitted piston to intercept any leakage from said plug, and meansfor actuating the pistons.

3. In a stop-cock or blow-off valve, the combination of a taper plug orpiston constructed with an internal bore, and adapted to receive acup-fitted piston, a spindle for the latter formed separate therefrom,means for lowering and raising said pistons, and means for removing thecups of saidauxiliary piston according to requirements.

4. In a blow-off valve, the combination of a valve-body having a mainpiston therein, a main spindle for raising and lowering said piston, acap-nut or plug located in the up- IOC IOS

IIC

per portion of said spindle, a cup-iitted piston movable within the boreof said main piston, a stem for said cup-fitted piston having a threadedportion-for engaging said plu g,and means for actuating said stem andspindle.

5. In a blow-off valve or cock, a body portion, a ring or valve-seat Dlocated therein, a main piston B movable within said body, and adaptedto seat in said ring, a main-valve stem or spindle for raising andlowering lsaid piston, a plug or cap-nut located in the upper portion ofsaid main stem, an internal piston located within said main piston andhaving a threaded stem passing through said capnut, a shoulder on saidlast-mentioned stem, said internal piston consisting of a cup adapted tocontact with said shoulder, a distancepiece having one end adapted tohold said cup in position, a lower cup adapted to contact, with thelower extremity of said distancepiece, and means for holding said cupsand distance-piece in assembled position.

G. In a blow-Gif valve, a valve-body provided with a male counterbore, ayoke llaving a lower portion into which said counterbore projects, agland located within said lower portion of said yoke, a main valve orpiston movable Within said gland, and body, and a cup-fitted pistonadapted to be moved independently of said main piston.

7. In a blow-off valve or cock, the combination of a main Valve orpiston, an internal cup-fitted piston, a spindle for each piston formedof a part separate therefrom and means for enabling said internal pistonto in tercept any leakage from the main valve.

8. In a blow-o valve, the combination of a Valve-body, a taper plugcontained therein, an auxiliary piston composed of cups anddistance-pieces, means for holding the latter in juxtaposition, anangular-shaped ring adapted to contact with said distance-pieces andTHOMAS M. EYNON.

Witnesses:

WM. C. WIEDERSHEIM, JACOB YKNOBELAUCH.

